Positive-stroke pump mechanism



P. CALLARD. POSITIVE STROKE PUMP MECHANISIVL.

1 2 9 1 l AU n u J d W m M P P A w N 0 H l H P A 2 O 7 3 0 8 3 O 3SHEETS-SHEET I.

FULL MEASURE Z WHEN OPEN 6 3 [Ill Qm ww 5 A? Z0 M R. P. CAlLARD.

POSITIVE STROKE PUMP MECHANISM.

APPLICATION FILED APR- I8, 1918.

Patented June 7, 1921.

3 SHEETSSHEET 3.

fave/7Z5: 05677 aa/zzarcz WW fuzz/Z655: fiziw ton rod 1 actuatedby areciprocating rack UNITED STATES ROBERT P. GALLARD, 015 FORT WAYNE,INDIANA..-

POSITIVE-STROKE PUMP MECHANISM.

Specification of Letters Patent.

Patented June 7, 1921.

Application filed April 18, 1918. Serial No. 229,343.

T 0 all 10 ham it may concern:

Be it known that I, ROBERT P. OALLARD, a citizen of the United States,residing at Fort Wayne, in the county of Allen and State of Indiana,have invented certain new and useful Improvements in Positive-StrokePump Mechanism, of which the following is a specification.

This invention relates to a mechanism for insuring the full stroke of apump, or like mechanism, and for preventing the reversal of apredetermined stroke without giving visible notice thereof, so that itwill be clearly evident to a customer that he is being short-measured.

The invention consists in the novel construction, combination, andarrangement of the parts. I

In the accompanying drawings Figure 1 is a view in elevation, with someparts shown in section, of a pump mechanism embodying theprinciple ofthis invention.

Fig. 2 is a sectional detail of the operating mechanism.

Fig. 3 is a sectional view taken on line 3-3 of Fig. 2. r

Fig. 4 is a view of the indicating mechanism.

Fig. 5 is another view of the indicating mechanism.

Fig. 6 is a sectional view taken on line 6-6 of Fig. 4; and

Fig. 7 is a sectional view taken on line 77 of Fig. 1.

In operating many well known types of dispensing apparatus, as pumps,and the like, it would be an easy matter for a dishonest person toshort-measure a customer by simply reversing the mechanism before theend of the stroke. The present invention provides meansfor preventingsuch reversal of the mechanism until it has been positively actuated forthefull predetermined stroke forwhich it has been set.

This mechanism is described as applied to a single-acting piston pumphaving a pis- 2. It might also be applied to a double-acting pump of anywell-known type, it being deemed unnecessary to illustrate any specificpumpstructure other than that shown. The rack is commonly actuated by a.pinion 3 mounted on a driving shaft 4:, and manually operated by meansof a. crank 5.

Associated with the rack is a stroke-setting mechanism comprising a rod6 seated at its lower end in the upper casing or manifold 7 of the pumpmechanism and adapted to be raised and lowered a certain distance, orindependently rotated with respect to the rack. The lower part of thisrod has a circular section 8 above which it IS formed with a squaresection 9. At the lower end of the rack 2 is a projecting arm 10 with afiat end which extends close to the rod 6, the squared surfaces thereofpermitting an adjustment of the rod to four diiferent positions, and thecircular portion 8 of the rod permitting its rotation to any one of thefour positions when this arm 10 is opposite the rounded portion 8. Therod carries a collar 11 which is engaged by the arm 10 in the lowermostposition of the rack, and it is only when it is in this position thatthe rod can be rotated. Carried by the rod are stops 12, 13 and let forlimiting the strokes of the pump rack, and each of these stops carriesan adjusting screw 15 with a lock nut 16 for accurately setting it to enage the arm 10. at a predetermined point. urrounding the rod at itslower end is a sleeve 17 having an internal keyway l8 and an externalgear 19, and resting upon the manifold 7. The internal keyway is engagedby a key 20'carried by the rod, thus permitting the longitudinalmovement of the rod without disengagement from the sleeve 17. Meshingwith the gear 19 of this sleeve is a gear segment 21, (see Fig. 3),carried by a pivoted member 22 from which extends a pointer- 23 movableover a graduated scale 24 on top of the pump manifold 7 so that by therotation of this setting member 21, as indicated by the pointer 23, therod 6 can be rotated when the pump rack is in its lowermost position toset any one of the predetermining stops so that the desired quantitywill be pumped upon the actuation of the pump rack.

At the upper end of the rod 6 is a collar .25 which also carries anadjustable limit and quantity stop 26 which is set by the rotation ofthe rod. The upper end of the rod is also slidably mounted in a casingpart 27, the end of the rod extending through the casing and carrying agear 28, held in place by a nut 29. \Vithin the casing a member 30 isattached to the rod between a shoulder 31 thereof, and a collar 32secured to the rod. A tubular projection 33 extends from one side of themember 30 in which is mounted a stop member 34 having an outer angularsurface and pressed outwardly therefrom by a spring 35. Attached to thecasing 27 is a plate 36 having notches 37 and 38 which are engaged bythe spring-pressed member 34, the notches being so arranged that thisstop member 34 engages the lowermost one when the rod 6 is in itslowermost position and engages the upper notch when the rod is raised,thus limiting the rod to two positions and yieldingly holding it ineither one of them until disengaged by the contact of the arm 10 carriedby the rack 2. Projecting from another side of this member 30 is a T-headed projection 39, the extensions of the head lying parallel with andadjacent the rack 2.

' In the casing 27 at the back of the rack 2, that is, opposite itstoothed portion, and between it and the rod 6 are guides 40 and 41,between which is a bearing plate 42 with an opening 43, through whichthe T-headed portion 39 of the member 30 extends, and with oppositelyinclined surfaces 44 and 45. Between these surfaces and the rack bearingrollers 46 and 47 are inserted, the surfaces being so inclined that theupper roller 47 acts as a roller clutch for the rack in its downwardmovement, and the lower roller 46 acts as a clutch in the upwardmovement of the rack, each of the rollers being provided with a spring48 which tends to hold it in the proper direction for this action. TheT-headed projection 39 is so proportioned that the extremities thereofare adapted to engage one or the other, but not both of the rollers 46and 47 for holding them out of clutching engagement, depending upon thedirection of movement of the rack 2. That is, when the rack has beenmoved to its lowermost position so that the arm 10 engages the collar 11and moves the rod 6 downwardly, the projection 39 will press thelowermost roller 46 out of engaging "position so that the rack can thenbe moved in the upward direction, and also when the rack has been movedupwardly to engage any one of the stops carried by the rod 6, the rodwill be raised to its upper position moving the projection 39 out. ofengagement with the lower roller 46, but into engagement with the roller47, thereby holding it out of clutching position so that the rack may bemoved downwardly. This insures the full stroke of the pump rack ineither direction before it can be reversed in its direction of movement.

Above the casing 27 is a plate 49 in which is an opening 50, and throughthis opening a number of quantity designations corresponding to thestops on the rod 6 may be visible. These designations are carried on aroller 51 mounted in a bracket 52, the roller having a beveled gear 53which meshes with a corresponding gear 54 which has also a spur toothedsection 55 which meshes with the gear 28 carried at the upper end of therod 6, the toothed section 55 being of suiticient length to permit thefull movement of the rod without the disengagement of gear 28. It willbe seen therefore that the rotation of the rod 6 by means of the settingmember 22 will cause a corresponding movement of the roller 51,. theindication of pivot of this member 56 which tends to press the plateportion 57 thereof over the opening 50 as soon as the rack 2 is raisedfrom its lowermost position. The outer face of the plate 49 may beprovided with a direction or instruction plate 62 adjacent the opening50 which will inform the customer of the operation of the device. Thedirection given on this plate in Fig. 1 is Full measure when open. Thiswill inform the customer that as long as the opening 50 is closed fromthe inside by the plate 57 the pump rack has not been operated the fulllength of the stroke for which the predetermining mechanism has beenset. The construction described app-lies to a singleacting pump in whichthe rack must be raised and then lowered to pump the required quantity,thus requiring only that the plate 57 shall uncover the designatingroller 51 only for one position, namely, the lowermost of the rack. If adouble-acting pump is used a second stop is provided for moving themember 56 to uncover the opening 50 when the rack is at the upper end ofits stroke. In either case, as soon as the full quantity has beendischarged by the full stroke of the rack, the opening 50 will beimmediately uncovered, thereupon disclosing the amount actually pumped.It may happen that it is necessary to stop the pump at some time beforethe end of a stroke, as for example, when discharging liquid into a tankof limited capacity, such as the tank of an automobile. If the tankbecomes full before the end of a strokeof the pump, the

pump cannot be reversed, and to continue the stroke of the pump in thesame direction would be to waste the liquid from the remainder of thestroke, or it might be the means of short-measuring the next customerthat amount of that stroke which has previously been given to thepreceding customer. Means is therefore provided for permitting thereversal of the pump rack before the end of the stroke by engaging theclutching roller which would prevent its reversal, and at the same timeproviding an indicating means which is visible through the opening 50 toshow that a short measure has been given. Secured to the operating shaft4, (see Fig. 3), is a gear 63, meshing with which is an idler 64 forcommunicating movement to a gear loosely mounted on the reduced portionof a shaft 66 rotatable in the casing 27 on a center in line with theopening 43 of the bearing plate 42. Secured to the outer end of thisshaft is a lever 67, and between it and the gear 65 is a spring 68 whichtends to press the gear against the shoulder formed by the reducedportion, thereby making a frictional engagement between the gear 65 andthe shaft 66. Keyed to the shaft 66, within the casing 27, are arms 69which extend around the sides of the member 30 and through the opening43 adjacent the projection 39, and the extremity of each of these armsis formed with a T-head 7 O for engaging the clutching rollers 46 and'47in the same manner that they are enga ed by the extremities of theprojection 39. he lever 67 engages a projection 71 of a cover plate 72and holds it below the opening 50 of plate 49 against the tension ofspring 73. This cover plate 72 is directly behind the plate 49 and infront of the cover plate 57, so that it in no way interferes with theoperation of the member 56, and the plate 72 carries some designation,such as the Words Short measure, or the like, which will indicate to thecustomer that a short measure has been given whenever this plate 72appears in the opening 50. In rotating the operating crank 5 the gear 63attached to the operating shaft 4 causes the arms 69 to be movedupwardly or downwardly from a central'position, depending upon thedirection of rotation of the operating crank. As the member 30 isshifted with the rod 6 at the ends of the stroke of the rack it mighthappen that in the last quarter of an inch of the travel of the rack itwill be locked by one of the rollers 46 and 47 due to the shiftingmovement of the T-projection 39 were it not for the fact that the arms69 do not actually move in the reverse direction until the direction ofrotation of the crank 5 is reversed. This is due to the fact that thelocking member 34-must be moved from one notch 37 to the, other notch 38in changing the engagement of the T- shaped projection 39 from the lowerroller 46 to the upper roller 47. It is seen therefore that 'in thismovement of the rod 6 from one position to the other the arms 69 are notactually shifted to the position assumed by the projection 39 until thedirection of the operatin crank is reversed. This prevents a possib eclutching interference in the last quarter of an inch or so of thetravel of the rack. In order, however, to reverse the direction ofrotation of the operating crank 5 at any point, for the purpose abovementioned, the lever 67 is raised from its engagement, with theprojection 71 which causes a corresponding movement of the arms 69bringing the projection 70 thereof in engagement with the upper clutchroller 47 and permitting the reverse or downward movement of the rack 2.The cover plate 72 is thereupon released and is drawn by the spring 73over the opening 50.

It will be observed that there may be a slight movement of the shaft 66upon which the arms 69 are mounted due to the reversal in direction ofrotation of the operating crank 5 and that this will cause acorresponding movement of the lever arm 67. When the rack is moved inthe downward direction the arms 69 are moved against the uppermostclutch roller 47, and this would cause the lever 67 to be raised to aslight extent. The upper edge of the plate 72, however, is locatedenough below the lower edge of the opening 50 so that the plate will notbe moved over any portion of the opening until the lever 67 is raisedmanually from engagement with the projection 71.

When the stops on the rod 6 are once adjusted and set for limiting theupper travel of the rack, there is no further necessity for adjustmentthereof and both the rod and the rack ma be inclosed by means of acasing 74 whic has a hinge 75 at one side and fastening devices 76 atthe other side for holding the case together, a support 77 beingprovided for the lower end thereof which rests upon the sleeve 17partially inclosing the lower end of the rod. In operation the rack isnormally at the bottom of its stroke against the collar 11, as

shown in Fig. 1, and in this position the rod 6 may be set for limitingthe stroke of the rack, as desired, by rotating the setting member 22 toany desired position, as indicated by the pointer 23. This will causethe indicating roller 51 to be correspondingly rotated, and thedesignation of the amount to be pumped will be visible through theopening 50. In this position the T-shaped member 39 will press theclutch roller 46 out of engaging position against the tension of itsspring 48, and the arms 69 will be in the lowermost position, as shownin Fig. 2. The actuation of the rack 2 by the rotation of the crank 5will allow the cover plate 57 51, the arms 69 will be presseddownwardly,

and the rod 6 will remain in its lowermost position until the arm 10 ofthe rack engages the stop which has been set in its path, whereupon therod 6 will be raised carrying with it the projection 39, and the clutchroller 46 will be prevented from locking the rack against the smallremainder of its stroke due to the shifting of the locking member 34from the notch 37 to the notch 38. After the rack reaches this end ofits stroke and sets the locking member in the upper notch 38, theoperating crank 5 can be reversed in rotation causing a reversedirection of the arms 69 until they too engage the uppermost roller 47.The rack is moved downwardly until the arm 10 strikes the collar 11, andas it approaches its lowermost position the projection 60 at the upperend of the rack engages the bent extremity of the link 58 raising theplate 57 from the opening 50. In order to reverse the stroke of the rackbefore the upper limit of its travel is reached, the lever 67 ismanually raised, thereby preventing the engagement of the clutchlngroller 47 which ordinarily would tend to prevent the downward movementof the rack until the member had been shifted. This movement of thelever 67 releases the short-measure indicating means which appears inthe opening 50.

It is obvious that others skilled in the art. to which this invention:relates may make various changeswithout departing from the spirit andsec e of the invention. Although particularly. esigned and intended'foruse in connection with single-acting pumps, the invention may be appliedto any mechanism in which it is desired to insure a predetermined lengthof stroke before reversal of the mechanism.

I claim 2-- 1. In a pump, a reciprocable rack, and means includingoppositely inclined surfaces adjacent the rack and a stop rollerdisposed between each of the surfaces and the rack, and means foralternately actuating the rollers only at the ends of the stroke of therackto permit reverse movement thereof.

2. The combination with a reciprocable member, of means includingoppositely inclined surfaces and a roller between each surface and saidreciprocating member to engage the member for preventing movement inopposite directions, and mechanism engaged by the member only at theends of its stroke to set said means for ermitting the IBVBI'SG movementOf the mem 81'.

3. The combination with a reciprocable rack, of means including twooppositely inclined surfaces and separate rotation members betweenthesurfaces and the rack for preventing movement of the rack in o positedirections, and mechanism engage by neeogzos the rack at opposite endsof its stroke to alternately set one of said members to engage and' theother member to allow movement of the rack in the reverse direction.

in, The combination with a reciprocable member, of separate stop rollersand oppositely inclined wedging surfaces therefor adjacent the member toprevent the movement of the member in opposite directions, a singledevice operative to directly engage one but not both of the saidrollers, and a rod connected to said device and having settable stopsthereon engaged by the reciprocable member for moving the device at theends of its stroke.

5. The combination with a reciprocable member, of .op ositely inclinedbearing means adjacent t e member, spring-pressed rollers cooperatingwith said bearing means to prevent movement of the member'in oppositedirections, a longitudinally movable rod, a member carried therebyhaving a projection to engage one but not both of the rollers at thesame time, adjustable stops carried by the rod, and a stop arm carriedby the reciprocable member and movable between the stops for moving therod at the end of the stroke of the reciprocable member to release theclutch roller Which permits the reverse movement ofthe reciprocablemember.

6. The combination with a reciprocable member, of a rotatable andlongitudinally movable stop rod adjacent thereto, rollers and oppositelyinclined wedging surfaces adjacent the member for preventing themovement of the member in opposite directions, a device carried by therod for engaging the said rollers and unaffected by the rotation of therod, and stops carried by the rod and brought into engaging position byrotation thereof to limit the travel of the reciprocable member, theengagement I of said stops by the member setting said rollers to permitthe reverse movement of the reciprocable' member only upon a completemovement thereof in one direction.

7. The combination with a reciprocable member, of spring-pressed rollersand oppositely inclined surfaces therefor adjacent the member forpreventing its movement in opposite directions, a stop rod engaged bythe member at the ends of its strokes and moved a shortdistance thereby,a projection carried by said rod for alternately engagin said rollers asthe member is reciprocate and means for holding the rod in either one oftwo positions.

8. In a pump, the combination with a reciprocable rack having aprojecting arm, of

the projection of the rack is opposite to it, a visible device arrangedto indicate the movement of said rack corresponding to the stop engagedthereby, and means for obscuring said device until the stroke of saidrack is completed.

9. The combination with a reciproc'able member, of means for variouslylimiting the length of stroke, a device at one end of-the member forindicating the length of stroke for which the means has been set, and acover for said indicating means operated by the member only at the endof the stroke of said member.

10. In a pump, the combination with a reciprocable rack, of means forpredetermining the length of stroke of the rack, an indicator inconnection with said means, and a spring-pressed cover for saidindicatorengaged by the rack for disclosing the indicator at one end of thestroke of said rack.

11. In a pump, the combination with a re'ciprocable rack, of a rotatablestop rod therefor, means at one end of the rod for setting it to stopthe rack at different lengths of strokes, means at the other end of therod for showing the position in which the rod has been set, and a deviceactuated by the rack for uncovering the indicating means when the rackis at one end of its stroke.

12. The combination with a reciprocable member, of a rotatable andlongitudinally movable rod having stops settable by the rotation of therod to limit the travel of the member, a sleeve keyed to the rod forsetting it in various rotated positions and permitting the longitudinal.movement of the rod, means for gripping the member to prevent movementin opposite directions, a device carried by the rod for releasing onebut not both of said gripping means at the same time and depending uponthe longitudinal position of the rod, a rotatable indicator for the rod,and means continuously connecting the indicator and the rod independentof the longitudinal movement of the rod.

13. In a pump, the combination with a reciprocable rack, of a settablestop rod which is longitudinally movable into one of two positions bythe engagement of the rack therewith, gripping means for the rack, adevice carried by the rod for releasing one of said gripping means topermit the reverse movement of the rack only when the rack has beenmoved to the end of its stroke in the other direction, and emergencymeans for releasing one of said gripping means to permit the reversemovement of the rack before a predetermined stroke has been completed inone direction of movement.

14. The combination with a reciprocable member, of gripping means forpreventing its movement in its directions of reclprocation, a stop .rodengaged by the member and member.

longitudinally movable with a projection therefrom to engage one of saidgrlpping means to permit the reverse movement of the member when astroke has been completed in one direction, and an emergency device forengaging the said gripping means to permit reversal of the reciprocatingmember before a stroke is completed in one. direction.

15. The combination with a reciprocable member, of gripping means forpreventing movement thereof in the directions of reciprocation, a stoprod for the member movable by engagement thereof into one of twopositions, a device carried by the rod for engaging one but not both ofsaid gripping,

means, and means depending upon the direction of movement of thereciprocating member for preventing the engagement of the gripping meanswhen the rod is moved from one position to the other near the end of thestroke of the said reciprocating cating the length of movement of themem-' ber, a cover operated by the member at one end of its stroke todisclose the indicating means, emergency means for permitting thereversal of the member between the limits of its stroke, and a visibleindicator for showing that less than a full stroke of said member hasbeen made.

18. In a single-acting pump, the combination with a rack reciprocable topumpdifferent quantities for different return strokes thereof, grippingmeans tending to prevent the reciprocation of the rack in bothdirections, a rotatable and longitudinally movable stop member havingmeans to rotate the rod to set diii'erent stops in the path of the rack,meanscarried by the rod for actuating the said gripping means by itslongitudinal movement to permit the reversal of the rack when itcompletes a stroke in-the other direction, a quantity indicator which isset for the diiferent quantities upon the rotation of the rod, aperforated plate through which the said quantities are visible, aspring-pressed cover for the perforation, means carried by the rack forraising the cover at the end of its return stroke, emergency meansincluding a manually operable handle for actuating the gripping means topermit reversal of the rack intermediate the ends of its strcke, and aspring-pressed innicater normally engagerl by the said emergency leveranal movable upon the actuation of the lever so that it is visiblethrough the perforated plate to show that less than the neeefieequantity for which the step rod has been set has actually been pumped.

' In testimony whereof I have signed my 10 name to this specification onthis 10th day of April, A, D. 1918.

ROBERT P, (JALLARD.

